The Sirocco Fan CES and Turbo Fan FTF models have standardized direct drives.
There are two types of direct action electric motor drives, the CES-D type has a universal electric motor while the CES-V has an electric motor with built in inverter. The FTF series is constructed so that the ventilator and electric motor shaft is combined. The FTF-MD model has a direct drive to the ventilator shaft with integral oil lubricated bearing box and the FTF-MC model goes through a direct coupling.